O2 is converted into O3 by the action of :
(a) infrared radiations (b) ultraviolet radiations
(b) gamma radiations (d) cosmic radiations
(b) ultraviolet radiations Oxygen is converted into ozone by ultraviolet radiations.
Name two sources, each of infrared radiations and ultraviolet radiations.
Give one use each of (a) microwaves , (b) ultraviolet radiations , (c) infrared radiations, and (d) gamma rays.
State one harmful effect each of the (a) ultraviolet and (b) infrared radiations.